feat: size widgets before adding

apps/docs/docs/getting-started/after-the-installation.mdx

@@ -203,6 +203,8 @@ In the modal you can edit the app that you want to display:
   </figcaption>
 </figure>
 
+When adding a widget, set its initial grid width and height directly in the preview. These size controls are only shown before the widget is added.
+
 As soon as you save your changes, the tile on the board will refresh and display your app.
 Resize from any visible edge or corner handle. For a Container, activate its top-left grip before using its resize handles.
 Press and hold a handle, move the pointer, and release it when the tile has the size you want.